I guess I was confused because the "Change Signature" DOES support generic method parameters. As well, it will change the signature of a Generic Method, as long as you don't want to change the generic type parameter of that Method.

Are there any plans to support this?

It would be an nice workaround to provide a "Delegate Method" refactor that was available in the "Refactor This" menu for Methods - much like the option during the "Change Signature," only stand-alone.